Two-stroke-cycle internal-combustion engine equipped with scavengingpump annex



lOst. 7, 1930. R. GAUPP TWO-STROKE CYCLE INTERNA LV COHBUSTION ENGINE EQUlPPED WITH SCAVENGING PUMP ANNEX Filed Dec. 12, 1928 2 Sheets-Sheet 1 /A/vfNro/P: Rupo/ F- Gnu Oct. 7, 1930. R. GAUPP v 41,777,841

TWO-STROKE CYCLE INTERNAL COIBUSTION ENGINE EQUIPED WITH SCAVENGING PUP ANNEX Filed D60. 12, 1928 2 Sho'etB-Shet '2 /N Vc/v Tof? A Rupo/ F GRUPPI;

Patented Oct. 7, 1930 UNITED .STATES PATENT OFFICE RUDOLF GAUPP, OF COLOGNE-ON-THELBHINE, GERMANY, ASSIGNOR TO MOTOREN- FABRIK DEUTZ, AKTIENGESELLSCHAFT, 0F COLOGNE-DEUTZ, GERMANY T'WO-BTROXE-('YYGII'LEv INTERNAL-COMBUSTION ENGINE EQUIPPED WITH SCAVENGING- PUMP ANNEX Appli-cation led December 12, 1928, Serial No. 325,517, and.l in Germany December 17,`1927.

My invention, which relates to internal combustion engines, and has among its objects the driving and positioning of the scavenging pump and associated parts in an improved manner, will be best understood from the following description when read in the liofht of the accompanying drawings of an em odiment of the invention.

The drawings illustrate one embodiment of an engine constructed according to the V,in-

. vention.

cylinder in the direction of the arrow A;

Fig. 3 is a section on the line C-D of Fig. 1;

Fig. 4 is a section on the line F-E of Fi 1; and f 1g. 5 1s la diagramshowing'the' relation between the movements of the air pump piston and working piston and the events and periods of the cycles of each.

Referrin to the drawing, a is the cylinder block o a vertical two stroke cycle Diesel engine. Attached to said cylinder block is the cylinder block b of the scavenging pump, the piston c of the latter being ]oined with the main-connecting rod e by means of the connecting rod d. The scavenging air is drawn in through the partially visible channels f and the suction valves g and forced through the channel h to the scavenging ports of the workin cylinder. The crank case' has no connection with the scavenging ports. The suction chamber Z is formed by the wall k, placed between exhaust pot and the air pump cylinder. The arrows indicate .the

courses of theiinowing and discharged air.-

The arrangement of the air conduits associated with the pump in the present embodiment of the invention is shown in Figs. 2 to 4.

It will be observed that this arrangement does notincrease the width of the pump cylinder block to\above that required to accommodate the pump iston.

It will be observed that by arranging the scavenging pumpnwith relation to the working cylinder and crank shaft as above." de' scribed, and driving it in the manner above described, the height of the engine measured :from the axis of the crank shaft to the top of the working cylinder is reduced to a minimum, this result being accentuated by connecting they scavenging pump piston to the connecting rod between the'ends of the latter and further accentuated by bending the conmeeting link toward the crank shaft. Further, t e arrangement permits the placing of the expansion chamber l between the exhaust potand pump cylinder block b, which provides compactness and ample space for the expansion chamber suflicientto permit eiective mufflin A The disp acement of` thel scavenging and working pistons for different positions of the crank shaft is shown diagrammatically in Fig. 5. In this figure the abscissas denote the different angles of the crank shaft, while the ordinates denote the volume displaced by the working and scavenging pistons, the full line curve representing the relations for the working piston and the dotted line curve the relations for the scavenging piston.

Referringto the diagram, it will be noted l that the scavenging ports begin to open when the pump piston has finished part of its inward stroke, thus scavenging air under pres sure is immediately 4available when the l y It will be understood that-Wide deviations tending through the space a connecting rod connecting said engine piston and engine crank, a scavenging pump having a pump cylinder and pump piston, said pump cylinder being at that side of said engine cylinder Which is occupied by said connecting rod when said engine piston makes its compression stroke and being at an obtuse angle to said engine cylinder, said pump being single acting With its Working chamber at the side of said pump piston remote from said engine cylinder, a link bent toward the crank shaft`connecting said connecting rod at an intermediate portion of its length to said pump piston for reciprocating the latter, and ports and passages connecting the working chamber of said pump to said scavenging port for delivering fresh air thereto.

2. A single acting non-reversible internal combustion engine having, in combination, an engine cylinder having an exhaust port and a scavenging port in the Wall thereof, an engine piston for controlling said ports, an engine crank shaft having an engine crank, a connecting rod connecting said engine piston and engine crank, a scavenging pump having a pump cylinder and pump piston, said pump cylinder being at that side of said engine cylinder which is occupied by said connecting rod When said engine piston makes its compressionstroke and being at an obtuse angle to said enginecylinder, said pump being single acting with its working chamber at the side of said pump piston remote from' said engine cylinder, a link uconnecting said connecting rod at an intermediate portion of its length to said pump piston for reciprocating the latter, an exhaust 4pot at the side of the engine cylinder above said scavenging pump, and an expansion chamber for the intake of said pump between said pot and pump.

3. A single acting non-reversible internal combustion engine having, in combination, an engine cylinder having an exhaust port and a scavenging port in the Wall thereof, an engine piston for controlling said ports, an engine crank shaft having an engine crank, a connecting rod connecting said engine pistonand engine crank, a scavenging pump having a pump cylinder and pump piston, said pump cylinder being at that.

side of said enginecylinder which is occupied by said connecting rod when said engine piston makes its compression stroke and being at an obtuse angle to said engine cylinder, the axial line of said pum `cylinder exetween said crank shaft and said piston, and a link connecting said connecting rod. at a point materially removed from each end thereof to said pump piston for reciprocating the latter combustion engine having, in combination,

A single' acting non-rversible internal an engine cylinder having an exhaust ort and a scavenging port in the Wall thereo an engine piston for controlling said ports, an engine crank shaft having an engine crank, a connecting rod connecting said'engine piston and engine crank, a scavenging pump having a pump cylinder and pump piston, said pump cylinder being at that side of said engine cylinder which is occupied by said connecting rod when said engine piston makes its compression stroke and being at an obtuse angle to said enginecylinder, the axial line of said pump cylinder extending through the space between said crank shaft and said piston, and a link bent toward the crank shaft connecting said connecting rod at a point materially removed from each end thereof to said .pump piston for reciprocating the latter.

5. A single acting non-reversible internal combustion engine having, in combination, an engine cylinder having an exhaust port and a scavenging port in the wall thereof, an engine piston for controlling said ports, an engine crank shaft having an engine crank, a connecting rod connecting said engine piston and engine crank, a scavenging pump having a pump cylinder and pump piston,

said pump cylinder being'at that side of said engine cylinder which is occupied by said connecting rod When said engine piston makes its compression stroke and being at an obtuse angle to said engine cylinder, said pump being single acting With its working chamber at the side of said pump piston remote from said engine cylinder, and a link bent toward said crank shaft connecting said connecting rod at an intermediate portion of its length to said pump piston for reciprocating the latter.

In testimony whereof, I have signed my name to this specification.

RUDOLF GAUPP. 

